AWS Certified Solutions Architect – Associate (2018)

I have recently cleared the AWS Certified Solutions Architect – Associate (2018).

Based on my preparation and the exam itself, i have compiled some points as per the index below.

Simple Storage Service (S3)

Virtual Private Cloud (VPC)

Elastic Compute Cloud (EC2)

Elastic Block Storage (EBS)

CloudWatch

Relational Database Service (RDS)

DynamoDB

Miscellaneous

AWS Certified Solution Architect – Points to remember (miscellaneous)

  1. Simple Queue Service.
    Use Visibility Timeout parameter to avoid duplication of message being processed.
    By Default AWS uses short polling which could incur unnecessary cost to empty response polling.
    Long polling should be used to avoid this.
    ReceiveMessage call sets WaitTimeSeconds to 0.
  2. Simple Notification Service usage.
  3. Simple Workflow Service Usage.
  4. Redshift is a Database Warehouse service.
  5. Uses block size of 1 MB. Compared to other databases which use 2 KB to 32 KB much more efficient and reduces IO’s.
  6. Kenesis is used for streaming data.

Check used port – Linux

Sometimes you might find issues starting up your SAP services, with a error that the service is not able to bind to a particular port.

In the example below, I was not able to start the SMTP service from SMICM.

icm

This mean, there could be another service that is already using this port.

Lets find out:

netstat -nepal | grep 25

icm1

Now we have the process ID. Lets see what is this process all about:

ps -ef | grep 6760

icm2

Postfix was using my service, which was not required.

Kill/Stop the service that is not required before starting your service again.

In my example:

# postfix stop 

Make sure that you disable the unwanted service from starting up next time when you reboot the server using chkconfig:

# chkconfig postfix off